128286705 has 32 divisors (see below), whose sum is σ = 209710080. Its totient is φ = 66951360.

The previous prime is 128286703. The next prime is 128286751. The reversal of 128286705 is 507682821.

It is not a de Polignac number, because 128286705 - 2¹ = 128286703 is a prime.

It is a super-3 number, since 3×128286705³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (128286703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173226 + ... + 173964.

It is an arithmetic number, because the mean of its divisors is an integer number (6553440).

Almost surely, 2^128286705 is an apocalyptic number.

128286705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128286705 is a deficient number, since it is larger than the sum of its proper divisors (81423375).

128286705 is a wasteful number, since it uses less digits than its factorization.

128286705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981.

The product of its (nonzero) digits is 53760, while the sum is 39.

The square root of 128286705 is about 11326.3721023106. The cubic root of 128286705 is about 504.3444161024.

The spelling of 128286705 in words is "one hundred twenty-eight million, two hundred eighty-six thousand, seven hundred five".